Sliding doors, also known as sliding gates or sliding panels, have a similar structural design across different brands. However, the quality of hardware and accessories can significantly affect the overall performance and durability. High-end brands typically use premium hardware that is more expensive but offers better functionality and longevity. On the other hand, cheaper options often compromise on materials, using lower-quality components that may wear out faster.

The main components of a sliding door include:

  • Vertical frame
  • Top rail
  • Bottom rail
  • Upper horizontal frame
  • Lower horizontal frame
  • Sub-bar
  • Top and bottom rollers
  • Core panel
  • Anti-collision bar
  • Positioner

The primary materials used in sliding doors are:

  • Stainless steel
  • Aluminum
  • Other alloys

Most modern sliding doors now use aluminum or aluminum alloys for the frame, with only some low-end brands still using stainless steel. This shift reflects both cost efficiency and improved performance characteristics.

Surface treatments available include:

  • Paint finish
  • Galvanized (chrome) coating
  • PVC cladding
  • Natural veneer

Common specifications for sliding door materials include:

  • Up and down rails: 6 meters per piece
  • Up and down horizontal bars / middle spacers: 4.88 meters per piece
  • Mullion: 4.88 meters per piece

Standard glass sizes are usually 1830mm x 2400mm or 1600mm x 2400mm. Wave boards come in dimensions of 2440mm x 130mm, while cabinet panels are typically 1220mm x 2440mm.

When it comes to aluminum used in sliding doors, there are two main types:

GB Aluminum: Made from high-quality aluminum ingots with added magnesium components. For example, aluminum alloy grade 5019 must contain over 4.5% magnesium according to national standards. It is strong, tough, and resistant to oxidation, making it ideal for long-term use.

Non-Standard Aluminum: Usually made from recycled waste aluminum. This type has poor toughness, insufficient hardness, and is prone to deformation, cracking, and oxidation, leading to a shorter lifespan.

Key indicators for evaluating the quality of sliding door profiles include:

  1. Profile Material: Whether it uses standard aluminum is a direct indicator of product quality and cost. Many market products now use non-standard recycled aluminum, which is hard for consumers to detect after surface treatment.
  2. Wall Thickness: A minimum of 1.2mm is recommended. The nominal wall thickness of door and window profiles should not be less than 1.20mm, and the measured thickness should meet GB/T 8478 and GB/T 8479 standards.
  3. Surface Treatment: Check if the paint is smooth and whether PVC cladding shows signs of bubbling or peeling.

The sliding wheel is one of the most critical components of a sliding door, directly affecting its performance and lifespan. Premium brands invest in high-quality wheels, often using large bearings and nylon wheels for smoother movement and longer durability. Lower-quality options may use cheap bearings and inferior materials, leading to noisy operation and frequent breakdowns.

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